Feat/cart promo api#521
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Description
Implemented promo code application support for carts by reusing the existing Coupon validation system.
Changes Made
Added POST
/api/cart/apply-promoendpointAdded cart route registration
Reused existing Coupon model for promo validation
Added discount calculation and validation logic
Added test coverage for:
Why
The repository already contains a Coupon model and validation infrastructure. This implementation avoids duplicating discount logic while providing the cart-specific promo application endpoint requested in #447.
closes #447